The Board of Health capped a 10-month public hearing process last night by setting new regulations to monitor General Chemical Corp. — during and after the facility closes.

Reacting to past violations of the hazardous waste handler’s 1994 site assignment, the board voted unanimously to issue new demands and set compliance deadlines.

For example, General Chemical must share a detailed closing plan and report to the Board of Health by July 30.

A post-closing plan is due Sept. 30 and is focused on community health and safety, security and nuisance conditions.

Last night’s decision marked the end of a lengthy, meticulous hearing process.

But even with the hearing over, town officials and concerned neighbors vowed to continue scrutinizing the facility’s impact on public health.

Backing up to the Woodrow Wilson Elementary School playground, the Leland Street plant sits on a contaminated plume of groundwater that experts say is encroaching on the neighborhood and spreading toward Sherborn.

General Chemical, which has stopped trucking in waste, is under pressure to decontaminate and fully close the facility and clean up the plume.

“This is a very, very long process that will continue to go on,” said Anne Sullivan, a member of the group Framingham Action Coalition For Environmental Safety, which mobilized last summer and has fought for public health and the firm’s shutdown.

“We’re in it for the long haul,” Sullivan said last night.

Board of Health Chairman Mike Hugo said the town will continue monitoring the company’s activities.

The state Department of Environmental Protection, he said, “has the lead oar in the water on this.”

Hugo alluded to the possibility of a lawsuit between the town and New Jersey-based company.

Town Counsel Chris Petrini went over key provisions of the 14-page modified site assignment, which takes effect immediately.

Petrini also met with the board and Public Health Director Ethan Mascoop behind closed doors at Wilson School before the open session.

In his introduction, he noted that General Chemical turned down the chance to provide testimony or cross-examine witnesses at the hearings.

Company representatives and an attorney attended a few early sessions before the firm informed the DEP on March 1 that it would close.

The new site assignment includes 49 conditions that General Chemical must follow.

Some of the requirements deal with site security and for the company to reach out to the neighborhood and keep residents apprised of facility-related news through public announcements in English, Spanish and Portuguese.

(Danielle Ameden can be reached at 508-626-4416 or dameden@wickedlocal.com. Follow her on Twitter @DanielleAmeden.)